Table 3. Single-factor analysis for underground miners in RP.
| Variables | Underground miner (n=612) | t | P | ||
|---|---|---|---|---|---|
| n | M | SD | |||
| Age (year) | 1.031 | 0.303 | |||
| <40 | 222 | 72.95 | 36.55 | ||
| ≥40 | 390 | 69.70 | 37.95 | ||
| Smoking | 0.524 | 0.600 | |||
| No | 236 | 71.88 | 36.29 | ||
| Yes | 376 | 70.25 | 38.19 | ||
| Drinking | 1.437 | 0.152 | |||
| No (including seldom drink) | 457 | 69.66 | 38.08 | ||
| Yes | 155 | 74.48 | 35.41 | ||
| Education level | 0.248 | 0.804 | |||
| Junior school and blow | 317 | 71.24 | 37.37 | ||
| High school and above | 295 | 70.49 | 37.61 | ||
| Average monthly income (RMB) | 0.195 | 0.846 | |||
| ≤2,000 | 246 | 71.24 | 37.51 | ||
| >2,000 | 366 | 70.64 | 37.47 | ||
| Marital status | 0.825 | 0.439 | |||
| Unmarried | 28 | 62.50 | 38.19 | ||
| Married | 566 | 71.16 | 37.35 | ||
| Divorced (widowed) | 18 | 75.00 | 40.22 | ||
| Place of residence | 0.908 | 0.364 | |||
| Town | 323 | 72.18 | 37.49 | ||
| Rural | 289 | 69.42 | 37.43 | ||
| Chronic disease | 1.252 | 0.211 | |||
| No | 547 | 71.53 | 37.32 | ||
| Yes | 65 | 65.38 | 38.45 | ||
| Medical insurance | 0.323 | 0.747 | |||
| Good | 436 | 71.19 | 37.64 | ||
| Bad | 176 | 70.11 | 37.09 | ||
| BMI (kg/m2)a | 1.786 | 0.169 | |||
| <18.5 | 81 | 67.83 | 37.12 | ||
| 18.5–25 | 460 | 70.25 | 37.90 | ||
| ≥25 | 71 | 78.44 | 34.42 | ||
| Job tenure for dust exposure (year)b | 2.368 | 0.070 | |||
| ≥0 to <10 | 234 | 73.18 | 35.79 | ||
| ≥10 to <20 | 166 | 74.48 | 35.41 | ||
| ≥20 to <30 | 168 | 66.22 | 40.87 | ||
| ≥30 | 44 | 62.82 | 38.25 | ||
a,b, one-ANOVA test was used. RP, physical health problems; BMI, body mass index; M, means; SD, standard deviation.